Earnings (Loss) per Share - Computation of Basic and Diluted Earnings (Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Numerator:
Income (loss) from continuing operations, net of tax	$ 837	$ (515)	$ 6,970	$ 3,404
Loss from discontinued operations, net	(66)	(118)	(183)	(339)
Net income (loss)	$ 771	$ (633)	$ 6,787	$ 3,065
Denominator:
Weighted average shares (denominator for basic earnings (loss) per share)	14,695	14,695	14,695	14,695
Effect of dilutive securities	113		51	224
Adjusted weighted average shares and assumed conversions (denominator for diluted earnings (loss) per share)	14,808	14,695	14,746	14,919
Basic earnings (loss) per share:
Income (loss) from continuing operations, net of tax	$ 0.06	$ (0.04)	$ 0.47	$ 0.23
Loss from discontinued operations, net	0.00	(0.01)	(0.01)	(0.02)
Basic earnings (loss) per share	0.05	(0.04)	0.46	0.21
Diluted earnings (loss) per share:
Income (loss) from continuing operations, net of tax	0.06	(0.04)	0.47	0.23
Loss from discontinued operations, net	0.00	(0.01)	(0.01)	(0.02)
Diluted earnings (loss) per share	$ 0.05	$ (0.04)	$ 0.46	$ 0.21